Scanning detection method for environmental gases and laser radar

Abstract

The invention discloses a scanning detection method for environmental gases and a laser radar. The scanning detection method comprises the following steps: selecting a first frequency point to the Nthfrequency point on a voltage-frequency scanning curve, and selecting a first control voltage to the Nth control voltage corresponding to each frequency point; controlling a wavelength tunable continuous laser to output scanning continuous light according to the ith control voltage, and finely tuning the ith control voltage to lock the frequency of the corresponding scanning continuous light of the ith frequency point; amplifying the scanning pulse light obtained after chopping the scanning continuous optical and then emitting the scanning pulse light to an environment to be detected; collecting gas echo signals of the environment to be detected so as to obtain corresponding gas absorption data from the first frequency point to the Nth frequency point; and determining the concentration distribution information of gases to be detected based on the gas absorption data. The scanning detection of the environment gases is realized through the wavelength tunable continuous laser, so that therequirement of the laser radar for the light source is reduced; and the frequency of the scanning continuous light is locked in the scanning detection process, so that the scanning detection precision is improved.

Description

technical field [0001] The invention relates to the field of laser remote sensing, and more specifically, relates to a method for scanning and detecting ambient gas and a laser radar. Background technique [0002] The detection of atmospheric gas composition is of great significance for the study of climate change and environmental protection. Especially with the rapid development of social economy, the emission of air pollutants has exceeded the carrying capacity of the environment. The existing in-situ measurement observations are not enough to quantify the global atmospheric pollutant emissions. The lidar method is to detect the atmospheric backscattering signal of actively emitting light pulses, which can provide the three-dimensional distribution of atmospheric trace gases. Due to its non-contact detection, With the characteristics of high temporal and spatial resolution and long detection distance, it is an effective means of detecting atmospheric gas components, and ...

AI Technical Summary

Problems solved by technology

The existing in-situ measurement observations are not enough to quantify the global atmospheric pollutant emissions. The lidar method is to detect the atmospheric backscattering signal of actively emitting light pulses, which can provide the three-dimensional distribution of atmospheric trace gases. Due to its non-contact detection, With the characteristics of high temporal and spatial resolution and long detection distance, it is an effective means for detecting atmospheric gas components, and can detect areas where in-situ measurement technology cannot be used due to location or safety issues

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